Centrifugal fan



Nov. 13, 1928.

J. A. WATKINS CENTRIFUGAL FAN Original Filed Dec. 18, 1920 2 Sheets-Sheet 1 awvuvco'c:

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Nov. 13, 1928.

J. A. WATKINS CENTRIFUGAL FAN Original Filed Dec. 18. 19 0 2 Sheets-Sheet centrifugal fans, and more particularly to the Patented Nov. 13, 1

JAMES A, WATKINS, 033* DE 'ro AMERICAN BLOWER 'oonronAfrion, ornnrno'rr, Mror'neAn, n conronarro'n on DELAWARE. Y 7

Original application filed December. 1:8,11920', Sertal na al-nae Divided;

November}, 1923.

This invention relates; to improvements in improved type of fan described in my application liled December 18, 1920, Serial No. 4313590, Patent No. 1,484,597 in which the fan is -provided with an improved fannular peripheral discharge nozzle, andthe usual scroll volute housing isdispensed with, thepresent application. being a division of said appl1ca--,

to the back disk 1 and front coned disk 2.. In

tion; F The object oft-he present invention ls to r simplify and reduce the cost of construction,

and to provide an improved; construction of the kind referred to,pa.rticu larly adapted for use in those instances in which a tan is em ployed with an engineer in anrachine having 7 an enclosing casing and afiy wheel.

Important novel characteristicsyof the invention reside in the special construction in which the engine or other inaelnnehas portions forming the annular peripheral d18- charge nozzle of the centrifugal fan, and parti'cularly in the special construction and association' of part-sin which: the engine or machine casing has a part constituting part of the peripheral discharge nozzle, and alsosuch a construction in which thefiy wheel is util-H ized to form part. of the discharge nozzle the resulting structure possessing materialact-1 vantages from the standpoint of simplicity -videdat one side: with a conoidalsurface The invention, with other objects and'ajd f vantages thereof, and the p articularconstrud tion combination s and arrangements ofparts comprising the same, will. be understood from the hereinafter contained detail description and economy in production.- I

when considered in connection with the accompanying drawings, forming part hereof,

and illustrating one embodiment of the invention.

In the drawings:

Figure 1 is a part section and side elevation of an internal combustion engine equlpped Figure 3 is a side elevation of the structure illustrated Figure 2 with part of the'front plate of the fan wheel brokenaway.

In the drawings the invention is illustrated in connection with one of the standard enrrrrunusua FAN-J Serial 1m erases.

designatesthe engine, a: the engine shaft and" b the-engine casinghaving 5 provided witlmai-r-inlet openings. .6;

construction shown comprisesa flmt back ring member or disk. I, front coned disk 2', and.

blades 3' located between and suitably secured this instance; the blade structure! shown consists of an inner: radially extending part 3*, an intermediate part 3? p diverging from the planeo l the inner" radiat portion 3,

the blades being disposed, as illustrated, with 1 reference to the directionrof" rotation of the an wheel indicated ab the arrow;

i 4 designates a fly w eel suitably secured t' the engine shaftmandhavinga hub part 4.,

portion of the fi-y wheel structure constituting the hub and part-ofthe backlend I wall or plate of thefanwheeln 3 The fly wheel islshown' pr0- at its huh part,'and with an annuilnrdeprester face flush with the adjoining.

continuation of the backringmember l and completing the back wall orend plate portion ofthefan wheel. 4" designates anannue lar recess to accommodate the projecting portions 5 of the blade connections. I Any suitable means may be employed to secure the hack ring member 1 to the fly wheel 4, that shown in the drawings consisting of screws 6.

I The'back ring member 1 'andthe front coned disk 2,. as shown, terminate substantially at the tips of the fan blades 3, and the annular peripheral discharge nozzle for the fan is formed by, the outer peripheral part 4 of the wheel land an annular extension 7 of the) engine casing adjoining an opening 8 in one sidethereoflsaid parts constitutingln efiect substantial contlnuations of the end walls or "Referring now to the improved centrifuged fan. of the present invention, the particular" crnoir; MICHIGAN, As'srenon,v BY ssmmsm a a nea-am filed v curved in approx;i mately a segment ofa cylinder, and an: outer I portion 3 extending 1n direct-ion '85 sionor recess, 9;, the backd-isk or ringn em- 1 her being seated inthere cessiwith itsfout j Y p I portion oi the conoidal' surface 4 ,,the latter forming a shrouding of the fan wheel, and having converging wall portions and outer diverging portions, the fly wheel 4 and fan wheel parts 1, 2. 3, rotating together, and the annular extension 7' of the engine casing being fixed, said annular extension 7extend1ng close along 7 side of the front disk 2 of the fan wheelbut' sufficiently spaced therefrom to permit free rotation of the front disk 2 relative thereto. The annular extension 7 of the enpgine casing whichis shown conical shaped corresponding; to the coned shaped form of the front cone'd disk 2 of the fan wheel and extending parallel tothe latter, is'provided with an outer outwardlyfiaring lip portioni". i The opposing side face of the outer peripheralportionp l oft-he fly wheel has an inwardlyeurved portion 9 extending from the outer marginal I w adge of the back disk 1 and flush with the outer face thereof, from thence a conicalportion 10, anduan outer outwardly-curved lip "portion10, n

The annular peripheral dischargenozzle formed by the annular extension 7 of the engine casing and the outer peripheral portion' l ofthe fly wheel 4 is shaped to con-- form to the path of the air as it would leave the fan wheelunder open discharge condi tions, no material chai'ige'in the direction of the air is effected, the nozzle simply acting to continue the-convergence of the air to sucha point as to give it suffic ent directlve velocity, and at thispoint-providingan eiiicient discharge. -I'n this way the diffusiontakes place a considerable distance from the fa nwheel, less disturbance-being caused at the exit of the blades resulting in increased efiiciency. i I

Thespeeial construction and arrangement of parts, hereinbefore described, as will. be

appreciated,results in considerable saving of material and the cost of production, the structureprovided being of a simple, compact and eiiicient nature. I I

While in the drawings is illustrated aispee cific embodiment of the invention; it will, of

, signature. 7

course be understood thatchanges and variations in the particular construction shown may be made; instead of the particular type of fan wheel and blade illustrated, the invenion may be practiced with the various other types'of fanwheels and embodied in other formsas will appeal to those skilled in the art, and falling within the scope of the appended claims, without departing fromthe spirit oftheinvention. I

What I claimis:

l. The combination with an engine having a casing, ofa fan wheelpositioned at one side of the flywheel of-the engine, said wheel having an outer annular peripheral" portion extending beyond the tips of the blades of the fan wheel, and the enginecasinghavinp; an opening and an annular exten sion ad'oinin said ooenin extendin be 0nd :1 J ta ta the tips of the fan blades, said outer peripha casing, of a fan Wheel, comprising a back ring member, a front disk, and blades between the back ring member and the front disk, the

back ring member and front disk terminating substantially at the tips of the blades of the wheel, said fan wheel being positioned adjacent thevfiy wheel of the engine and secured to thefiy wheel, the engine casing having'an opening and an annularextension adjoining,

said opening, said annular extension extending beyond the tips of the blades of the wheel, and said fly wheel having an outer annular peripheral portion extending beyond the tips of the blades, said outer peripheral portion of the fir; wheel and said annular extension of the engine easing forming an annular dis-' charge nozzle" for'the fan wheel. 7

i In testimony whereof. I hereunto affix my Je MESA. WATKINS. 

